If I'm reading your post correctly, you are concerned that your starter will not be enough. Do you have a stir plate, if not your starter could benefit from some light agitation. Perhaps you have your lager starter chilled right now. Many people on the forum make their starters at normal temperatures and chill it before they pitch it in.
I'm sure it will turn out fine. If you are really concerned, rehydrate a packet of dry lager yeast and throw that in with the other starter.
How old was the yeast? You may need to do a step up or two with your starter.
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